The biggest most obvious problem, the conversion rates. These rates are abysmal to say the least. The prices on items seem fair but the conversion rates are absolute dogshit. To me the only things worth buying are T6CC, the T4A, 7* Sigs, and Relic mats.
Next, the cap on the conversion rates is such a stupid and disgusting thing to do. I like many people I know, saved and didnt claim a lot of glory hoping to trade them in for a good amount of essentia for better purchases, but not only are the rates horrible, theres a limit to how much you can exchange, half the items are priced awfully.
Another problem is getting rid of all the other stores right on launch of the essentia store. Like they plan to do with the mysterium store, the launch of essentia should have also been a gradual change and shift to this new currency.
The last few problems, is the lack of items to purchase, and the HORRID pricing of raid tickets. Like half the essentia players can get at the moment will be used just for raid tickets, which is made worse by the fact that raids start today.
Honestly this is overall just a good concept, with horrible execution. I do not mind Kabam spacing out content and updates like the new Carina's coming out weekly and not at once to gain retention for the game, but adding the caps to already such horrible rates is not a good first look.